Well I took apart 3 different brands of wireless fan controllers to compare to the Insteon FanLinc. I believe they all work by switching in different capacitors in series to the fan motor. All capacitors that I observed were rated for 250V. The fanlinc had two labelled 825K and 475K, which I believe correspond to 8.25 uF and 4.75 UF, The Casablanca controller had 3 caps, 10 uF, 5 uF, and 1.8 uF. The Minka Aire controller had 2 caps, 4 uF and 5 uF. The Home Depot one had a 5 uF and 6 uF cap. My current theory is that I should try replacing the 8.25 uF cap in the fanlinc with a 10 uF cap. I think that the Casablanca controller differs from the others in that the 1.8 uF cap may be used for the high speed, but the other controllers may not use any.